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Key-frame extraction has been a focused problem of human action recognition due to its effectiveness, efficiency and importance in action understanding. According to the characteristics of human motion perception, this paper proposes a new key-frame extraction framework based on motion change points. And in order to detect motion change points robustly, a hysteresis extrema seeking algorithm has been...
Web page content extraction is a fundamental step in the application of data mining which supplies pure data source with little noise. The original web page with fully embedded with contentirrelevant information such as JavaScript and advertisements is mixed with noise. The purity of the data makes a difference in application. Consequently, a web information extraction model based on statistical and...
The computation of the sparse principal component of a matrix is equivalent to the identification of its principal submatrix with the largest maximum eigenvalue. Finding this optimal submatrix is what renders the problem -hard. In this paper, we prove that, if the matrix is positive semidefinite and its rank is constant, then its sparse principal component is polynomially computable. Our...
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